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This directory combines historical reference rows with separately labelled national sources. Read the source title, observation date, printed units and conditions on each entry. National source observations do not establish all measures applicable to a shipment.

United States Customs Tariff for HS Code 840991

Engines; parts, suitable for use solely or principally with spark-ignition internal combustion piston engines (for other than aircraft)

USITC 2026 HTS Revision 19

26,806 official source entries are searchable. Checked 2026-09-22; edition published 2026-09-15.

Printed tariff and statistical lines from this edition, separate from historical WITS averages. Blank duty cells are not a confirmed zero. Review the parent tariff line, general and chapter notes, chapter 99, origin, exclusions, quotas and additional duties. No shipment total or special-rate eligibility is calculated. The edition publication date is not a line-level effective date.

Official schedule and source documentation

Official entries matching 840991

8409.91.10

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines):

Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery

Column 1 — General
Free
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
10%
Official source for this code

8409.91.10.40

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery

For vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704

Source units: kg

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.10 — read its printed duties and notes

Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery

  • Column 1 — General: Free
  • Column 1 — Special (eligibility required): No amount printed.
  • Column 2: 10%
Open parent line in the official schedule
Official source for this code

8409.91.10.60

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery

For marine propulsion engines

Source units: kg

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.10 — read its printed duties and notes

Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery

  • Column 1 — General: Free
  • Column 1 — Special (eligibility required): No amount printed.
  • Column 2: 10%
Open parent line in the official schedule
Official source for this code

8409.91.10.80

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery

Other

Source units: kg

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.10 — read its printed duties and notes

Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery

  • Column 1 — General: Free
  • Column 1 — Special (eligibility required): No amount printed.
  • Column 2: 10%
Open parent line in the official schedule
Official source for this code

8409.91.30.00

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other: › To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704:

Aluminum cylinder heads

Source units: No., kg

Column 1 — General
2.5%
Column 1 — Special (eligibility required)
Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2
35%
Official source for this code

8409.91.50

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other: › To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704:

Other

Column 1 — General
2.5%
Column 1 — Special (eligibility required)
Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2
35%
Official source for this code

8409.91.50.10

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other: › To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704: › Other

Connecting rods

Source units: No., kg

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.50 — read its printed duties and notes

Other

  • Column 1 — General: 2.5%
  • Column 1 — Special (eligibility required): Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
  • Column 2: 35%
Open parent line in the official schedule
Official source for this code

8409.91.50.81

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other: › To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704: › Other

Steel forgings

Source units: kg

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.50 — read its printed duties and notes

Other

  • Column 1 — General: 2.5%
  • Column 1 — Special (eligibility required): Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
  • Column 2: 35%
Open parent line in the official schedule
Official source for this code

8409.91.50.85

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other: › To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704: › Other

Other

Source units: kg, No.

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.50 — read its printed duties and notes

Other

  • Column 1 — General: 2.5%
  • Column 1 — Special (eligibility required): Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
  • Column 2: 35%
Open parent line in the official schedule
Official source for this code

8409.91.92

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other:

For marine propulsion engines

Column 1 — General
2.5%
Column 1 — Special (eligibility required)
Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2
35%
Official source for this code

8409.91.92.10

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other: › For marine propulsion engines

Connecting rods

Source units: No., kg

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.92 — read its printed duties and notes

For marine propulsion engines

  • Column 1 — General: 2.5%
  • Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
  • Column 2: 35%
Open parent line in the official schedule
Official source for this code

8409.91.92.90

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other: › For marine propulsion engines

Other

Source units: kg

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.92 — read its printed duties and notes

For marine propulsion engines

  • Column 1 — General: 2.5%
  • Column 1 — Special (eligibility required): Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
  • Column 2: 35%
Open parent line in the official schedule
Official source for this code

8409.91.99

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other:

Other

Column 1 — General
2.5%
Column 1 — Special (eligibility required)
Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
Column 2
35%
Official source for this code

8409.91.99.10

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other: › Other

Connecting rods

Source units: No., kg

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.99 — read its printed duties and notes

Other

  • Column 1 — General: 2.5%
  • Column 1 — Special (eligibility required): Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
  • Column 2: 35%
Open parent line in the official schedule
Official source for this code

8409.91.99.90

Parts suitable for use solely or principally with the engines of heading 8407 or 8408: › Other: › Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines): › Other: › Other

Other

Source units: kg

Column 1 — General
No amount printed on this row; not a confirmed zero.
Column 1 — Special (eligibility required)
No amount printed on this row; not a confirmed zero.
Column 2
No amount printed on this row; not a confirmed zero.
Parent tariff line 8409.91.99 — read its printed duties and notes

Other

  • Column 1 — General: 2.5%
  • Column 1 — Special (eligibility required): Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)
  • Column 2: 35%
Open parent line in the official schedule
Official source for this code
WITS 2023 historical MFN average

Reported average: 2%.

Source year: 2023. Classification: HS 2022 (H6). Checked 2026-09-14.

National lines included: 5 of 5. Excluded from the average: 0.

Reported ad-valorem range: 0%–2.5%.

Reported historical ad-valorem MFN simple average for 2023, not a national tariff schedule. No preferential rates, additional duties, VAT, excise or import permissions are determined.

Not a current 2026 national duty. The HS6 average does not determine the duty of a particular national subdivision, origin or shipment.

WITS observation for this code and year

UN Comtrade H6 descriptions (HS 2022)

WITS API definitions: reported averages and excluded national lines

Direct HS code answer for United States

United States HS Code 840991: 2.00% (2023 MFN average)

The source reports an indicative HS6 MFN average of 2.00% (2023 MFN average) for Engines; parts, suitable for use solely or principally with spark-ignition internal combustion piston engines (for other than aircraft).Source status: not assessed. Verify the exact national tariff line, origin treatment, taxes, restrictions, and current customs guidance before using this information in a declaration.

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Customs tariff summary

Country
United States
HS / tariff code
840991
Description
Engines; parts, suitable for use solely or principally with spark-ignition internal combustion piston engines (for other than aircraft)
Chapter
84 —
Heading
8409
Subheading
840991
Indicative MFN HS6 average
2.00% (2023 MFN average)
VAT / tax
Check local VAT and excise rules for the import destination.
Unit / basis
Not listed in this tariff line
Source / vintage
WITS / UNCTAD TRAINS — 2023 MFN HS6 reference

Historical MFN average

2.00% (2023 MFN average)

Import permission

not assessed

Import planning

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Details

HS Code
840991
Chapter
84 —
Heading
8409
Subheading
840991

Compare HS code 840991 across GCC countries

Each destination shows its own source label. Oman uses its national schedule; Qatar and UAE entries may cite their separately published references and unresolved exceptions. Other entries retain the historical GCC reference. National codes, duty notes, restrictions and tax treatment can differ; verify with the destination customs authority.

Saudi ArabiaSearch parent HS 840991United Arab EmiratesSearch parent HS 840991OmanSearch parent HS 840991QatarSearch parent HS 840991KuwaitSearch parent HS 840991BahrainSearch parent HS 840991

Related HS Codes (Heading 8409)

HS CodeDescriptionDuty
840910Engines; parts of aircraft engines (spark-ignition reciprocating or rotary internal combustion piston engines)0.00% (2023 MFN average)WITS 2023 historical MFN average
840999Engines; parts for internal combustion piston engines (excluding spark-ignition)1.25% (2023 MFN average)WITS 2023 historical MFN average

Data source: WITS/UNCTAD TRAINS (MFN 2022). Values are indicative HS6 MFN averages, not shipment-specific applied rates. Import permission and restrictions are not assessed. Historical reference rates exclude VAT, excise and other national measures. Separate national entries preserve the columns printed by their source; these are not a complete shipment assessment. Full disclaimer.